System and method for event-dependent state activation for a dual-mode mobile communication device

ABSTRACT

A handheld mobile station system capable of automatically answering voice calls is disclosed. The system is comprised of a handheld mobile station, a magnet detection system within the mobile station, a magnet within a mobile station holster located in close proximity to the magnet detection system when the mobile station is stored in the holster wherein the mobile station is operable in a first, second, and third state. The first state occurs when the mobile station is stored in the holster and is ready to receive a voice call. The second state happens when the mobile station is stored in the holster and receiving an incoming voice call. The third state occurs when the mobile station is removed sufficiently out of the holster such that the magnet detection system no longer detects the close proximity of the magnet thereto thereby automatically answering the incoming voice call.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 11/481,234, whichwas filed on Jul. 5, 2006, which is a continuation of U.S. Ser. No.10/016,957, filed on Dec. 7, 2001 and now U.S. Pat. No. 7,076,267. Theentire disclosure and the drawing figures of these prior applicationsare hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This application relates to mobile devices. Specifically, thisapplication relates to dual-mode communication devices for providingvoice and data communications.

2. Description of the State of the Art

Mobile devices are known. Example mobile devices include cellulartelephones, personal digital assistants (“PDAs”), wireless data deviceslike two-way pagers, voice/data communicators, etc. Recently, manycompanies have attempted to provide a mobile device that serves avariety of communication and organisational needs, such as datacommunication, voice communication or PDA functionality. For example,companies that primarily manufacture cellular telephones for voicecommunication, such as Nokia and Ericsson have integrated PDAfunctionality into their products. Firms that primarily manufacture PDAdevices, such as Palm and Handspring, have integrated a wireless datamodem into their products to provide data communication. And firms thatprimarily manufacture wireless data devices, such as Motorola andResearch In Motion, have combined the functionality of a wireless datadevice, such as a two-way pager, with PDA functions.

Typically, in order to initiate or end an incoming voice communicationon a mobile device, a key must be depressed. Usually, keys are dedicatedon the keypad or keyboard solely for this function, such as ‘TALK’ or‘SEND’ buttons to answer an incoming call, or ‘END’ to hang up a call.

Most PDA devices come with a holster or other carrying means. To answeran incoming voice call when a device is within a holster, the user wouldhave to pull the device out of the holster and then press one or morebuttons. A user needs to be able to quickly answer calls withoutsearching for keys to press in order to connect the phone call. A useralso needs to be able to quickly end calls without searching for keys topress.

SUMMARY

A system and method for changing the state for a dual-mode communicationdevice or a handheld mobile station is provided. The system includes amobile station with a magnet detection system, a magnet in a holsterlocated in close proximity to the magnet detection system when themobile station is stored in the holster wherein the mobile station isoperable in a first, second and third state. The first state occurs whenthe mobile station is stored in the holster and is ready to receive avoice call. The second state occurs when the mobile station is still inthe holster and receives an incoming voice call. The third state happenswhen the mobile station is sufficiently removed from the holster suchthat the magnet detection system no longer detects the close proximityof the magnet and thereby automatically answering the incoming voicecall with no further input from the user. The device includes atransceiver, a display mounted within the front surface of the devicehousing, a QWERTY keyboard mounted below the display and within thefront surface of the device housing, a microphone and a speaker, and asystem for detecting that the device is within the holster.

The method includes steps of receiving an incoming voice call on thedevice, notifying the user of the voice call, removing the device fromits holster, detecting that the device has been removed from the holsterand then automatically answering the voice call without further inputfrom the user.

The method continues with steps of detecting that the device has beenreturned to the holster and then changing from the third state to thefirst state upon detection, thereby hanging up the phone call.

Further features of the invention will be described or will becomeapparent in the course of the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

In order that the invention may be more clearly understood, the one ormore embodiments thereof will now be described in detail by way ofexample, with reference to the accompanying drawings, in which:

FIG. 1 is a block diagram of a handheld mobile station;

FIG. 2 is an exploded view of the device;

FIG. 2A is a view of the back of the PCB shown in FIG. 2;

FIG. 3 is rear view of a holster for the device;

FIG. 3A is a rear view of the holster in FIG. 3 with the device in theholster;

FIG. 4 is a circuit diagram of the magnetic detection system;

FIG. 5 is a flow diagram describing the method in which the dual-modedevice changes from a first state to a second state while in the holsterand to a third state when removed from the holster.

DETAILED DESCRIPTION

Turning now to the drawing figures, FIG. 1 is a block diagram of adual-mode mobile communication device 10 or mobile station (hereinreferred to as device). The device 10 includes a transceiver 11, amicroprocessor 38, a display 22, Flash memory 24, RAM memory 26,auxiliary input/output (I/O) devices 28, a serial port 30, a keyboard32, a speaker 34, a microphone 36, a magnet detection system 37, ashort-range wireless communications sub-system 40, and may also includeother device sub-systems 42. The transceiver 11 preferably includestransmit and receive antennas 16, 18, a receiver 12, a transmitter 14,one or more local oscillators 13, and a digital signal processor 20.Within the Flash memory 24, the device 10 preferably includes aplurality of software modules 24A-24N that can be executed by themicroprocessor 38 (and/or the DSP 20), including a voice communicationmodule 24A, a data communication module 24B, and a plurality of otheroperational modules 24N for carrying out a plurality of other functions.

The mobile communication device 10 is preferably a two-way communicationdevice having voice and data communication capabilities. Thus, forexample, the device may communicate over a voice network, such as any ofthe analog or digital cellular networks, and may also communicate over adata network. The voice and data networks are depicted in FIG. 1 by thecommunication tower 19. These voice and data networks may be separatecommunication networks using separate infrastructure, such as basestations, network controllers, etc., or they may be integrated into asingle wireless network.

A magnet is also shown in FIG. 1, outside of the device, in closephysical proximity to the magnet detection system. This magnet ispreferably located on a holster that is preferably used for storing thedevice. Thus, when the device is stored in the holster, the magnet ofthe holster is in close proximity to the device's magnet detectionsystem.

FIG. 2 shows a handheld mobile communication device assembly 10 whichhas a first device housing section 60 and a second device housingsection 62 which as described above cooperate to couple together, usingfasteners. It should be appreciated that fasteners are but one exampleof possible components that may be used to couple the device housingsections together. However, the device housing sections are preferablycoupled together using releasable fasteners such as screws.

Also shown in FIG. 2 is a PCB (printed circuit board) 64, upon whichmost of the internal components of the mobile communication device arepreferably mounted. The keyboard 32 is preferably formed by positioninga key web 33A over a plurality of switches 33B on the PCB 64. The keyweb 33A and plurality of switches 33B are preferably configured suchthat each key in the key web 33A contacts and operates one of theswitches 33B when the key is depressed. Other configurations may also beimplemented, in which the number of switches 33B may be less than thenumber of keys on the key web 33A. The key web 33A and switches 33B onPCB 64 are also positioned such that the apertures 35 at least partiallyexpose the keyboard 32. As will be apparent from FIG. 2, portions of thekey web 33A will be exposed by the apertures 35 to provide key surfacesthat may be depressed by a user of the device 10 to provide data inputto the device 10. Such data input may for example be used to generatedata communications on the device 10. In the example device 10 shown inFIG. 2, the auxiliary key 28E is adjacent to the keyboard 32, such thatthe auxiliary key 28E is shown as part of the key web 33A and at leastpartially exposed by the aperture 29E. However, in alternateembodiments, the auxiliary key 28E or other auxiliary keys (not shown)need not be provided as part of the key web 33A. Such keys may beseparate from the key web 33A.

The display 22 is also preferably mounted on the PCB 64, as shown inFIG. 2. When the first device housing section 60 and second devicehousing section 62 are coupled together, the aperture 23 in the firstdevice housing section 60 at least partially exposes the display 22. Forexample, the aperture 23 in the first device housing section 60 and thedisplay 22 on the PCB 64 may be positioned such that a viewing area 25of the display is exposed. The frame and other components associatedwith the display 22 are preferably hidden from view when the first andsecond device housing sections 60 and 62 are coupled together.

The speaker 34 is preferably mounted at or near the top of the PCB 64.One or more apertures 35 in the first device housing section 60 arepositioned to at least partially expose the speaker 34 when the firstand second device housing sections 60 and 62 are coupled together.

In the example assembly shown in FIG. 2, the microphone 36 is preferablymounted in the second device housing section 62. The microphone 36 is atleast partially exposed by the aperture 39 in the second device housingsection, and coupled to the PCB and other device components. Audio orvoice inputs to the microphone 36 may be used for example to generatevoice communications.

The device housing sections may include further apertures to expose orpartially expose other device components. In the first device housingsection 60, apertures 70, 72 and 74 are configured to partially exposethe auxiliary I/O devices not shown in FIG. 2. The aperture 68 issimilarly positioned in the second device housing section 62 to at leastpartially expose an auxiliary I/O device (not shown) which is preferablyan IrDA (Infrared Data Association) port. As described above, theaperture 29E at least partially exposes the auxiliary key 28E. Theaperture 66 in the second device housing section 62 may be provided toaccommodate a power supply such as a battery. Other apertures may alsobe provided in the device housing as necessary.

The first and second device housing sections, when coupled together,form a handheld mobile communication device housing enclosing the PCBand internal components therein. The apertures 35, 23, 50 and 39 atleast partially expose the speaker 34, display 22, keyboard 32 andmicrophone 36 respectively. Partial exposure of these components allowsa user to make use of these components while at the same time protectingthe components from damage. Apertures 29E, 68, 70, 72, 74 similarlyexpose and protect auxiliary I/O devices. When access to a componentwill normally be required relatively infrequently, a removable coverelement may be provided for a corresponding device housing aperture. Inthe above example of a device power supply, a cover (not shown) ispreferably provided for the aperture 66. Access to the power supply isthereby possible when required; yet the battery remains protected whenaccess thereto is not necessary.

Auxiliary I/O device 28A is a thumbwheel input device (seen in FIG. 2A)and is preferably mounted along the right hand side surface of thedevice housing 60, 62 immediately adjacent to the display 22. Thethumbwheel input device 28A is used to select information on the displayscreen 22, and is thus optimally positioned adjacent to the displayscreen 22. Other mounting positions of the thumbwheel input device 28Aare also possible, such as on the left side surface or in the frontsurface. The auxiliary input key 28E may be a device power key, abacklight key for turning a backlight for the display 22 on and off, amode key for switching between voice communication, data communicationand possibly other device functional modes, for example.

FIG. 2A shows the back of the PCB from FIG. 2. This view of the PCB 64shows the auxiliary input device 28A as a thumbwheel. It is preferablymounted in the top right-hand corner of the PCB 64 in this view. Thisview also shows the location of the magnet detection system 80. Thecomponents for the magnetic detection system 80 are preferably locatedclose to the centre of the PCB 64 near the bottom. Other internalcomponents of the device 10 may also be mounted on the PCB 64. Thedevice components are interconnected to provide for at least data andvoice communication functionality, possibly in addition to further localnon-communication functions and short- range communication functions.The internal components of the device 10 are interconnected asnecessary, through wired connections, PCB tracks, other types ofconnectors or connections, or possibly combinations thereof.

FIG. 3 shows the rear view of a typical holster for a device. Theholster 104 preferably comprises a back 108 and sides 106 and bottom 110that extend toward the front to form a repository for a mobile handhelddevice. Specifically, the holster 104 is generally open and includescurved side portions 106 and a bottom 110 formed to conform to the shapeof the mobile handheld device.

The holster 104 will preferably have a clip assembly 114 that includes aclip that is spring loaded and attached to the back 108. The manner ofattachment and assembly of the clip to the back 108 is described inPatent Application No. 09/305174 Retaining Clip Assembly filed May 4,1999.

The holster 104 will preferably have a magnet 124 preferably located onthe back 108 above the portion that forms the bottom 110 of the holster.The magnet 124 will be positioned preferably at an equidistant locationfrom the sides 106 of the holster. The location of the magnet 124 ispreferably in conjunction with the location of the magnet detectionsystem 80 in the device when the device is placed in the holster.

FIG. 3 also shows how the device 10 is inserted into the holster 104.The device 10 preferably slides vertically downwards into the opening ofthe holster from the top of the holster 104. The device 10 is positionedsuch that the display screen 22 is facing the inside of the back of theholster 108 and the bottom of the device is pointing downwards such thatthe bottom of the device preferably engages the bottom of the holsterwhen it is properly inserted. When the device 10 is properly inserted,the magnet 124 of the holster will preferably line up with the magnetdetection system 80 of the device.

FIG. 3A shows the device inserted into the holster. The back of theholster 108 preferably obscures the display screen 22 of the device.Because the screen 22 is obscured, the device may shut off the screenwhen stored in the holster to conserve battery power. When in theholster, the device's magnet detection system 80 preferably lines upwith the holster magnet 124 so that the magnet 124 is in close physicalproximity to the magnet detection system 80.

FIG. 4 is a circuit diagram of the preferred embodiment of the magnetdetection system. The circuit preferably utilizes a Hall effect magneticproximity sensor to detect the near presence of a permanent magnetmounted in the device's holster. This information is used by systemsoftware to alter operation modes in order to effect power saving anduser notification differences between the in-holster and out-of-holsterstates.

The proximity sensor makes use of the Hall effect phenomenon, in which amaterial with a current flowing through it and a magnetic field passingthrough it in a direction perpendicular to the direction of the currentflow, will develop a voltage across it in a direction that is orthogonalto, and a magnitude that is proportional to the magnitudes of both thecurrent and the field

In FIG. 4, the magnet itself is not shown schematically, but itspresence in close proximity to the sensor device 140 causes that deviceto change its output from a high level signal to a low level signal.This signal appears on 142, which is preferably read at a digital inputport of the system's microprocessor 38. The VCC and GND labels refer tothe sensor power supply. Capacitor 144 decouples from the power supplycurrent glitches that occur during switching of the sensor output.Resistor 146 preferably increases the output 144 when the magnet 124 isnot present, as this signal is not actually driven to a high level bythe sensor 140. Capacitor 148 preferably decouples high-frequencyinterference that appears on the output signal line 142, especially whenthe system wireless is transmitting, from the sensor device 140. Thesensor device 140 uses very little operating current, and operation maybe adversely affected by high-frequency disturbances being rectified byparasitic diodes inside the device.

FIG. 5 is a flow diagram describing the preferred method in which thedevice changes from a first state to a second state while in the holsterand to a third state when removed from the holster. A device isinitially in a first state or an idle state while in its holster, readyto accept a voice call. In step 200, the device enters a second statewhen it receives a phone call while still in the holster. If the userhas set the device to accept all calls, then in step 206, the devicepreferably changes to the third state by automatically answering thevoice call, and displaying the caller information when the user takesthe device out of the holster. The device preferably changes from thesecond state to the third state once it no longer senses the magnet inthe holster. When the user has finished the voice call, the user willreplace the device in the holster in step 208. In step 210, the devicewill sense the presence of the holster magnet, and preferably ends thevoice call and returns to the first or idle state.

If the device is not set to accept all calls in step 204, usuallybecause the user wishes to see the caller information before answeringthe voice call, then in step 210, the device will display the callerinformation on the screen when the user pulls the device from theholster and the device will prompt the user to accept or reject thecall. If the user chooses to accept the call in step 212, then thedevice will answer the call in step 214. Once the user has finished thevoice call and replaces the device in the holster in step 208, thedevice will sense the presence of the holster magnet, and return to thefirst or idle state.

If the user does not choose to accept the call in step 214, then thecall will be rejected and forwarded to voicemail in step 216.

Another embodiment of the invention would be for the device to onlyanswer certain calls by pulling the device from the holster. This couldbe accomplished by allowing the user to select phone numbers from whichthe user wishes to receive calls. If a call comes in to the device fromone of these phone numbers, then the device will notify the user of thecall and answer the call as soon as the user pulls the device from theholster with no further input from the user. The notification may be atype of sound, such as a ring, or vibration. If a call comes in and isnot from one of the user-selected phone numbers, the device may notifythe user with a different type of notification to allow distinguish fromthe user-selected phone calls. Once the user pulls the device from theholster, the caller information may be displayed on the screen and thedevice will preferably prompt the user to accept or reject the call. Ifthe user does not wish to accept any other calls except for the phonenumbers the user has selected, the user may be able to forward theunwanted voice calls to voice mail.

A further embodiment of the invention would include the pre-processingof data messages when the device is in the holster. Encrypted andcompressed data messages take time to decrypt and decompress. If thedevice is in the holster and the magnet detection system detects themagnet, then when an encrypted, compressed data message is received bythe device, rather than immediately notifying the user of the arrival ofthe message, the device may first decrypt and decompress the message.Once the message has been processed thusly, the device preferablynotifies the user of the message arrival. When the user removes thedevice from the holster, the device preferably automatically opens themessage for the user to view.

It will be appreciated that the above description relates to thepreferred embodiment by way of example only. Many variations on theinvention will be obvious to those knowledgeable in the field, and suchobvious variations are within the scope of the invention as describedand claimed, whether or not expressly described.

1. A mobile communication device for use with a holster for receivingand holding the mobile communication device, comprising: a voice systemfor processing received voice calls; a data system for processingreceived data messages; a detection system for detecting that the mobilecommunication device is in the holster and for placing the mobilecommunication device into an idle state; a receiver for receiving anincoming signal while the mobile communication device is in the idlestate, means for determining if the incoming signal is a data message,and for delaying notification of the received data message until themobile communication device is able to decrypt and decompress the datamessage, and for subsequently notifying a user of the received datamessage; and means for determining if the incoming signal is a voicecall, and for determining whether the voice call originated from auser-selected group of phone numbers, and if so, for notifying the userof the received voice call.
 2. The mobile communication device of claim1, wherein the detection system detects that the mobile communicationdevice has been removed from the holster; and means, responsive to thedetection system, for automatically opening the received data messageand displaying it to the user of the device.
 3. The mobile communicationdevice of claim 1, wherein the detection system detects that the mobilecommunication device has been removed from the holster; and means,responsive to the detection system, for automatically answering thevoice call without the user having to select a button or other interfaceelement of the mobile communication device.
 4. The mobile communicationdevice of claim 3, further comprising: means for displaying calleridentification information regarding the answered voice call.
 5. Amobile communication device, comprising: a system for sensing that themobile communication device has been placed into a holster, and forcausing the mobile communication device to be placed into an idle state;a receiver for receiving a voice call at the mobile communication devicewhile it is in the holster; means for notifying a user of the mobilecommunication device that the voice call has been received; and meansfor determining whether the mobile communication device is programmed toautomatically answer voice calls upon removal of the mobilecommunication device from the holster; means, responsive to the devicebeing configured to automatically answer voice calls, for automaticallyanswering the voice call upon removal of the mobile communication devicefrom the holster; and means, responsive to the device not beingconfigured to automatically answer voice calls, for displaying callerinformation regarding the received voice call and for prompting the userto answer the call upon removal of the mobile communication device fromthe holster.
 6. The mobile communication device of claim 5, wherein theprocessor automatically displays caller information regarding thereceived voice call.
 7. The mobile communication device of claim 5,wherein the sensing system senses when the mobile communication deviceis returned to the holster and in response thereto, the processorautomatically terminates the voice call.
 8. The mobile communicationdevice of claim 5, further comprising: a memory for storing a userselected group of phone numbers that are to be automatically answered;means for determining whether the received voice call is from a phonenumber on the stored user selected group of phone numbers; wherein ifthe received voice call is on the user selected group of phone numbers,then the processor automatically answers the voice call when the deviceis removed from the holster; and wherein if the received voice call isnot on the user selected group of phone numbers, then the processordisplays caller information regarding the received voice call andprompts the user to answer the call.
 9. The mobile communication deviceof claim 8, wherein if the received voice call is on the user selectedgroup of phone numbers then the processor executes a first notificationon the mobile communication device; and wherein if the received voicecall is not on the user selected group of phone numbers then theprocessor executes a second notification on the mobile communicationdevice.
 10. A mobile communication device, comprising: a receiver forreceiving an encrypted and compressed data message at the mobilecommunication device, means for delaying notification of the receiveddata message until the mobile communication device is able to decryptand decompress the data messages, and once the data message has beendecrypted and decompressed, for notifying a user of the received datamessage; and means, responsive to the mobile communication device beingremoved from a holster, for automatically opening and displaying thedecrypted and decompressed data message to the user.
 11. A method forprocessing data messages in a mobile communication device having a datainterface for receiving and processing data messages, comprising:receiving an incoming signal at the mobile communication device;determining whether the incoming signal is a data message, and if so,then delaying notification of the received data message until the mobilecommunication device is able to decrypt the data message, and once thedata message has been decrypted, then notifying a user of the receiveddata message.
 12. The method of claim 11, further comprising:determining if the incoming signal is a voice call, and if so, thendetermining whether the voice call originated from a user-selected groupof phone numbers, and if so, then notifying the user of the receivedvoice call.
 13. The method of claim 11, further comprising: removing themobile communication device from a holster; detecting that the device isno longer in the holster; and automatically opening the received datamessage and displaying it to the user of the device.
 14. The method ofclaim 12, further comprising: removing the mobile communication devicefrom a holster detecting that the device is no longer in the holster;and automatically answering the voice call without the user having toselect a button or other interface element of the mobile communicationdevice.
 15. The method of claim 14, further comprising: displayingcaller identification information regarding the answered voice call. 16.A method for processing data messages in a mobile communication devicehaving a data interface for receiving and processing data messages,comprising: receiving an incoming signal at the mobile communicationdevice; determining whether the incoming signal is a data message, andif so, then delaying notification of the received data message until themobile communication device is able to decompress the data message, andonce the data message has been decompressed, then notifying a user ofthe received data message.
 17. The method of claim 16, furthercomprising: determining if the incoming signal is a voice call, and ifso, then determining whether the voice call originated from auser-selected group of phone numbers, and if so, then notifying the userof the received voice call.
 18. The method of claim 16, furthercomprising: removing the mobile communication device from a holster;detecting that the device is no longer in the holster; and automaticallyopening the received data message and displaying it to the user of thedevice.
 19. The method of claim 17, further comprising: removing themobile communication device from a holster; detecting that the device isno longer in the holster; and in response thereto, automaticallyanswering the voice call without the user having to select a button orother interface element of the mobile communication device.
 20. Themethod of claim 19, further comprising: displaying caller identificationinformation regarding the answered voice call.
 21. A mobilecommunication device, comprising: a data interface for receiving andprocessing data messages; a receiver for receiving an incoming signalwhile the mobile communication device is in an idle state; means fordetermining if the incoming signal is a data message, and for delayingnotification of the received data message until the mobile communicationdevice is able to decrypt the data message, and for subsequentlynotifying a user of the received data message.
 22. The mobilecommunication device of claim 21, further comprising: a voice interfacefor receiving and processing voice calls; and means for determining ifthe incoming signal is a voice call, and for determining whether thevoice call originated from a user-selected group of phone numbers, andif so, for notifying the user of the received voice call.
 23. The mobilecommunication device of claim 21, further comprising a system fordetecting that the mobile communication device has been removed from aholster; and means, responsive to the detection system, forautomatically opening the received data message and displaying it to theuser of the device.
 24. The mobile communication device of claim 22,further comprising a system for detecting that the mobile communicationdevice has been removed from a holster; and means, responsive to thedetection system, for automatically answering the voice call without theuser having to select a button or other interface element of the mobilecommunication device.
 25. The mobile communication device of claim 24,further comprising: means for displaying caller identificationinformation regarding the answered voice call.
 26. A mobilecommunication device, comprising: a data interface for receiving andprocessing data messages; a receiver for receiving an incoming signalwhile the mobile communication device is in an idle state; means fordetermining if the incoming signal is a data message, and for delayingnotification of the received data message until the mobile communicationdevice is able to decompress the data message, and for subsequentlynotifying a user of the received data message.
 27. The mobilecommunication device of claim 26, further comprising: a voice interfacefor receiving and processing voice calls; and means for determining ifthe incoming signal is a voice call, and for determining whether thevoice call originated from a user-selected group of phone numbers, andif so, for notifying the user of the received voice call.
 28. A methodof processing a voice call with a mobile communication device,comprising: receiving an incoming voice call at the mobile communicationdevice; notifying the user of the mobile communication device that avoice call has been received; if the mobile communication device is setto accept any incoming voice call then automatically answering the voicecall when the mobile communication device is removed from a holster; andif the mobile communication device is not set to accept any incomingvoice call then automatically displaying caller information regardingthe voice call on a display of the mobile communication device when themobile communication device is removed from a holster and prompting theuser of the mobile communication device whether the voice call should beanswered.
 29. The method of claim 28, further comprising: placing themobile communication device back in the holster and automaticallyhanging up the received voice call.